Radio dial



April 18, 1939- w. J. SCHNELL RADIO DIAL 3 Sheets-Sheet 1 Filed Aug. 4, 1957 April 18, 1939. w. .17 SCHNELL RADIO DIAL Filed Aug. 4, 1937 3 Sheets-Sheet 2 April 18, 1939. w. J. SCHNELL 2,155,101

RADIO DIAL Filed Aug. 4, 1937 3 SheetsSheet 3 2 04 E08 510 /GT 194 J'clzrzel jyb m @293,

Patented Apr. 18, 1939 UNITED STATES PATENT OFFICE RADIO DIAL Application August 4, 1937, Serial No. 157,262

13 Claims.

This invention .relates to a tuning indicator and dial assembly for radio receivers and the like.

In present-day receivers various tuning aids of the so-called automatic type have been provided, but such aids, by reason of their complexity, high cost, and space requirements, are restricted in use to the-larger and more expensive provide a compact and efl'icient tuning aid having readily adjustable marking devices for indicating the position to which the tuning element of the receiver should be moved to tune the same 20 to the station represented by indicia inscribed on said marking device.

A further object. of applicants invention is to provide a tuning aid and dial assembly of pleasing appearance, simple and compact construc- 5 tion, providing means for rapidly and precisely tuning the receiver to any one of a number of desired broadcasting stations.

Another object of the invention is to provide a tuning aid providing adjustable station indicat- 30 ing marking devices, the adjustment of which may be accomplished manually without the aid of tools of any kind and from the exterior of the radio receiver with which the tuning aid is associated.

35 Another object of the invention is to provide a tuning indicator dial assembly having readily detachable and adjustable station indicating marking devices for indicating and controlling the position to which the tuning element of the 40 radio receiver should be moved to tune the receiver to any one of a number of desired broadcasting stations; and wherein any desired number of said marking devicesmay be associated with the dial assembly as desired.

45 Another object of the'invention is to provide a compact, unitary dial assembly and tuning aid readily associatable with the usual tuning control shaft of any ordinary radio receiver.

Another object of the invention is to provide a 50 tuning aid and dial assembly of the above stated character wherein the dial is provided with a plurality of different band scales with a partie ularly simple, compact, and efllcient means for selectively indicating which of the bands the re- 55 ceiver is tuned to.

Other and further advantages of the invention will be apparent from the following description when taken in connection with the accompanying drawings wherein:

Fig. 1 is a fragmentary front elevation 01a 5 radio*receiver embodying the invention.

Fig. 2 is a fragmentary horizontal section taken on the line 22 of Fig. 1.

Fig. 3 is a fragmentary vertical section taken on the line 3-3 of Fig. 1.

Fig. 4 is an enlarged fragmentary section taken on the line 4-4 of Fig. 1.

Fig. 5 is an enlarged view in perspective of a control and marking device constructed in accordance with the invention.

Fig. 6 is an exploded view in perspective of a portion of the device of Fig. 5.

Fig. 7 is an exploded view in perspective of another portion of the device in Fig. 5.

Fig. 8 isan enlarged view in perspective of a motion limiting device forming part of the invention.

Fig. 9 is a fragmentary front elevation of a radio receiver embodying a modified form of tuning aid and dial assembly constructed in 8.0- cordance with the invention.

Fig. 10 is an enlarged fragmentary vertical section taken on the line Hie-l0 of Fig. 9.

Fig. 11 is a view in perspective of a control and marking device employed in connection with the modified form of Fig. 9.

Fig. 12 is an exploded view in perspective of a certain portion of the device of Fig. 11.

Fig. 13 is an explodedview in perspective of other portions of the device of Fig. 11.

Fig. 14 is a view in perspective of a position determining element employed with the modified form of Fig. 9. i

As shown in Figs. 1 to 3, the front panel 2 is provided with an opening 4 receiving an escutcheon ring 6 having an outwardly turned flange or lip portion 8 enclosing the edge of the opening.

The tuning control device comprises an operating shaft 1 (Figs. 2.and 3) journaled in a plate l2 having forwardly, then upwardly, projecting supporting portions l4, to the upwardly projecting portions of which is secured in any desired manner a plate It adapted to extend behind and cover the opening 4 in the face panel 2. The plate It is provided with a central opening l8 (Fig. 3) which is closed by a translucent or transparent," preferably colored, plate 20 secured to the plate adjacent said opening in any desired manner, .assmr example by rivets 22.

The plate I8, which is preferably opaque, is supported by brackets 24 (Fig. 2) secured to the plate and to the front of the frame or chassis 28 of the radio receiver.

The shaft I8 at its inner or rearward end carries an operating pulley 28 which is connected by a belt, string, cord, or like member 38, to a pulley 82 secured to the shaft 34 of the tuning condenser 38 (Fig. 2). The diameter oL the pull y 28 is one-half the diameter of the pulley n in order that the operating shaft I8 may move through a complete revolution to 'move the tuning condenser through one-half of a revolution. It will be evident that other motion transmitting mechanisms than the belt and pulleys disclosed may be employed as desired, the form disclosed being merely illustrative.

The plate or bracket I2 upon which the shaft I8 is journaled is additionally supported by a bracing member 38 secured thereto and to the chassis28asshowninFig.3. K

The shaft 1I8 extends through a suitable opening centrally of the plate 28 and terminates within the plane of the face panel 2 concentrically with the opening 4. A circular dial plate 48 (Fig. 4), preferably of glass or other transparent or translucent material, is mounted upon this extending end of the shaft and for this purpose is provided with a central. opening through which the shaft extends. The circular dial plate 48 is secured to the shaft for rotation therewith between a pair of washers 42 and 44, preferably of felt or other suitable material, clamped against the face of the plate by a nut 45 threaded on the extending end of the shaft and by a cap member 48 secured to the end of the shaft by a screw 48. The face of the dial plate 'is etched with a plurality of (preferably three) circular broadcast scales 88, 52 and (Fig. l) and to the rimof this, plate is clamped a controlling member 58 of the-following construction.

This controlling member comprises a pair of interfltting, preferably sheet metal, members having radially disposed annular depressions formed by inwardly bent flanges 58, 8'8, 82 and 84 joined by flanges 88 and 88 through which spaced rivets or otherv fastening means I8 are passed to secure the interfltting members. The rear member (designated as I2 in Fig. 3) is provided with an inwardly extending annular flange 14 andan outwardly extending annular flange I8, the latter flange being bent inwardly to form a peripheral flange 18. .'Th e forward member (designated by the reference character 88 in Fig. 4) is provided with inwardly and outwardly extending flanges 82 and 84, respectively, the flange 82 being bent inwardly to provide an annular flange 88 and the flange 84 being bent inwardly to form a'peripheral flange 88.

The'dial plate48 is, clamped between the inwardly extending flanges l4 and 82 by a gasket 88 of felt or like material and a gasket 82, preferably of cork, the latter gasket resting upon the annular flange 88 of the member 88. In mounting the glass plate on the control member 58, the same may be placed with the gaskets 88 and 82 between the flanges 14 and 82 and the rivets I8 or other fastening means thereafter applied to cause the gaskets to clampingly engage the rim of the plate 48. The outwardly extending flanges 88 knurled as at 88, and a reduced threaded end portion I88. The threaded end portion I88 passes loosely through an opening I82 in the forwardly bent end portion I84. A sheet metal member I88 is provided with a downwardly depending boxlike structure I88 open at its opposite ends and formed integrally with the end portion I84. The member I88 is preferably formed" from a flat strip of sheet metal by first suitably bending the end portion I84 at right angles to the remaining portion of the strip and then bending the edges of the remaining portion forwardly and inwardly to form the box-like structure I88. The end portion I84 is formed with means to slidably retain the member. I88 in the slot formed by the flanges I8 and 88 of the controlling member 88;

, This means preferably comprises a pair. of downwardly depending lugs II8 formed integrally with the end portion I84 in alinement with-the opening I82 in said end portion. The member I88 is adjustably secured to the controlling member 58 by the selectively operable control means or elements .84. For this purpose a nut H2 is adapted to be received on the threaded end portion I88 of each of the control elements, rotation of the nut relative to the end portion I84 being prevented by the lugs I I8.

The box-like structure I88 forming a part of each member I88 is adapted to receive a marking device preferably comprising a folded transparent or translucent strip II4 of any suitable material such as Pyroxlin between the folds of which is carried a strip II8 of any transparent or translucent material adapted to be inscribed with indicia representing the call letters of a broadcast station. The folded strip I I4 possesses suflicient resiliency to retain itself and the strip II8 in the box-like structure I88. In order to further insure the retention of the folded strip H4 and the strip II8 in said box-like structure, the upper free edges of the strip I I4 are bent forwardly to provide concave-convex lugs II8 and I28 adapted to engage the forward edge of said structure. The lugs II8 and I28 also provide means to readily lift'the strip H4 and the strip II8 out of the member I88.

Means are provided for readily inserting the control means or elements 84 into, or removing them from, the annular way or guide 85. This means comprises, as shown in Fig. 2, recesses or groovesl22, I24,-I28 and'I28, the grooves I22 and I28 being cut into the edge of the flange 18, and the grooves I24 and I28 being cut into the edge of the flange 88. The grooves I22 and I24 are alined and form an opening into the way or.

nuts I I2 received between the lugs II8. The grooves I28 and I28 are similarly alined and form an opening of a similar size, which opening is spaced from .the opening formed by the grooves I22 and I24.

Mounted upon the controlling member 58 in the space between these" rooves is a movement limiting means or element I38 best shown in Fig. 8. This limiting means or element I38 preferably comprises a small sheet metal member having an upstanding flange I32 and a forwardly projecting flange I84 provided at its opposite edges with integral. downwardly depending lugs I38 and I38 adapted to be slidin ly received within the slot formed between the flanges I8 and 88. The forwardly extendin flange I34 is pro- Means are provided for indicating the position to which the controllin member 56 should be moved selectively to tune the'radio receiver "to each of the stations represented on lthe marking strip I I6. This means comprises a generally U- shaped sheet metal member I42. one leg of which is secured inany desired manner as by screws I44 to the plate I6 below the controlling mem ber 56 in a vertical plane passing through the 1 axis of the shaft no. The legs of the U-shaped position indicator I42 are spaced apart a suf ficient distance to accommodate and permit free movement of the fingers 96 between said legs; The rearward leg of the position indicator I42 is provided awith a central struck-out portion forming 'a' forwardly projecting lug I46adapted to engage an edge of the flange I32 of the limiting element I 30 and thereby prevent rotation of the controlling member 56 through a greater angle than 360 degrees and the rotation of thetuning element 36v through-a greater angle than 180 degrees. It is evident that such means insures against damaging of the tuning element by a toorapid movement to either extreme position.

The translucent or transparent backing plate 20 is provided with a narrow, vertically disposed slot I48, best shown in Fig. 1, which extends from a point substantially in alinement with the edge of the cap 46 to a point substantially in alinement with the inner circular edge of the controlling member 56. This slot I48 provides a way or guide for a band indicator-I50 and a reference line or tuning position indicator for the scales 50, 52 and 54. 4

The band indicator preferably comprises a pin I52 secured to or formed with a slide plate I54 (Fig. 1) slidably received .in and guided by the inturned flanges of a guide plate I56 secured to the supporting plate I2 (Fig. 3). The pin I52 .is provided with a reduced portion I56 (Fig. 3)

slidably received in and guided by the slot I48 in the plate 20 and is provided at its outer end with a contrastingly colored, preferably white, disk portion I60. The slide plate I54 is reciprocated vertically by a manually operableknob I62 (Figs. 1 and 2) secured on the outer end of a stud shaft I64passing through the front panel 2 of the radio receiver and carrying on its inner end a crank I66. The crank I66 is pivotally connected by a pin and slot connection to a bell-crank I68 pivoted to the plate I2 as at II0. Thebell-crank I68 is pivotally connected at its-opposite end by a suitable pin and slot connection to the slide plate I54. It will be evident that as the manually operable knob I62is oscillated, the disk portion I60 will be moved upwardly and downwardly across the scales 50, 52 and 54. v

The manually operable knob I62 also controls through suitable conventional mechanism (not shown) the band selective circuits of the receiver and the movement of the disk-like portion I60 is .made to correspond with the selective energization of these band circuits whereby said disk cooperates with the band scales 50, 52 and 54 to I more or less frequently tune the receiver.

indicate the band to which the receiver is adjusted.

Suitable illuminating means, such as lamps'II2 and. I", are mounted on suitable brackets I16 and I18 secured to the rear supporting plate I2 in position behind and within the area of the translucent or transparent back plate 20. These lamps provide means for not only illuminating the scales 50, 52, and 54, but also for illuminating the marking strips II6. I

' Vernier tuning means are provided comprising a manually operable knob I80 secured to'a shaft I82 extending through the front panel 2 of the radio receiver and connected by a string: belt, cord or the like I84 to a large pulley I86 rotatably secured to the shaft 34 of the tuning element (Figs. 1 and 2). Since the shaft 34 is connected to the shaft I by the pulleys 28 and 32 and the belt or the like 30, the controlling member 56 anddial plate 40 will follow the movement imparted'to the shaft 34 by the manual vernier control knob I60.

The assembling and controlling of the selectively'operable control means or elements 94 and their associated marking devices upon the controlling rnember 56.is accomplished as follows. A strip H6 is first marked with the call letters of a broadcasting station to which it is desired to This marked strip is then inserted between the folds of the strip I I4 and the latter is placed in the box-like structure I06 of a member I06. A

finger 96 and its nut H2 is then loosely secured to this member I06. The member I06 is then mounted upon the rim of the controlling member 56 by inserting the downwardly depending lugs II 0 of this member and the nut II2, nonrotatably secured therebetween, into the opening provided by the pair of recesses I 22, I24, or the pair of recesses I26, I28, in the edge of the flanges "and 88, after which the lugs H0 and nut ,II2 are adjustably moved or slid along the way or guide-85 to a position wherein the center of the marking strip H6 is alined with the particular scale indication corresponding to the broadcasting station the call letters of which are marked on the strip-I I6. The finger 96 is then rotated to cause the nut II2 to securely clamp this finger and the marking device to the periphery of the controlling member 56.

Any desired. number of selectively operable means or elements 94 and associated marking devices may be similarly mounted on the periphery of the controlling member 56, as best shown in Fig. 1.

The assembling of these elements having been completed, the tuning of the receiver is accomplished as follows. Assuming that it isdesired to tune the receiver to a station, the marking device for which lies in a position to the right of the movement limiting element I 30 and between this element and the position indicator I42, the upper edge of the selected finger 96 will be engaged by the operators finger, preferably the index finger, and the controlling member 56 is thereupon rotated in a clockwise direction.

As the selected finger 96 approaches the position" 1 and the marking device to which the receiver is tuned at any instant, thereby giving a selective luminous indication of the station to which the receiver is tuned.

In the form of the invention disclosed in Figs. 9 to 13, each selectively operable control means or element 94' comprises a push button or like depressible member adjustably mounted on the periphery of ;the controlling member 56. Each of these depressible members comprises a pair of inter'fitting cups I88 and I90, the cup I90 being provided at its outer edge with a portion rebent to form an. annular recess for receiving the outer edge of the cup I88 and a retaining ring I92. Within the cup I88 behind the ring I92 is loosely received a transparent or translucent cover disk I94. A disk I96, of any suitable material adapted to receive indicia representative of a selective broadcasting station, is held in clamping engagement with the inner face of the disk I94 by the depending disk-like portion I98 of an adjustable stop member 200. The stop member 200 has a rearwardly extending portion 202 provided with an elongated slot 204. The slot 204 is adapted to receive a screw 206 having an enlarged head 208, a reduced cylindrical portion 2I0 and a further reduced threaded end portion 2I2.

Pointer means 2I4 comprise a pointer portion 2I6, a right angularly bent portion 2I8 and a disk-like depending portion 220. The portion 2I8 is provided with an opening 222 to loosely receive the threaded portion 2I2 of the screw 206 and the disk-like portion 220 is provided with forwardly projecting lugs 224 punched from the body of the disk-like portion. The lugs 224 are adapted to be received in suitable slots 226 in the bottom of the cup I88 being bent over the inner face of this bottom of the cup to secure the pointer means 2 I4 thereto.

A nut 228 cooperates with the screw 206 to clamp -the .sele'ctively operable, depressible member to the peripheral'fianges I8 and 88 of the controlling member 56. It should be noted that the axial length of the cylindrical portion 2I0 of the screw 206 is slightly greater than the thickness of the portion 202 of the stop member 200 in order thatthis stop member may be moved forwardly and backwardly and may have free sliding movement relative to the controlling member 56. A resilient means, such as a coiled spring 230, is interposed between the disk-like portion I98 of the stop member 200 and the bottom of the cup I88, the forward movement of this member and'the disks I94 and I96 being limitedby the retaining ring I92 formed on the cup I90.

. The selectively operable control means or elements 94 are assembled as follows. The stop member 200 and the spring 230 are first inserted in a cup I88, the rearwardly extending portion 202 passing through a slot 232 in the bottom of the cup. The disk I96, suitably inscribed with indicia representing the call letters of a desired broadcasting station, and a cover disk I94 are then inserted into the open end of the cup I88 and the cup I is then fitted over the cup I88. The screw 206 is then passed through the slot 204 of the stop member and through the opening 222 in the pointer means 2I4 and loosely threaded into the nut 228. The assembled control means or, element 94' is then placed in position on the periphery of the control member 58 and angularly adjusted relative thereto in the manner heretofore described in connection with the form of the invention disclosed in Figs. 1 to 8. The movement limiting element I30, heretofore described, is secured to the rim of the controlling member 56 and this element cooperates with the upwardly and forwardly projecting lug 234 formed integrally with a stop element 236 (Figs. 9 and 14) The stop element 236 is provided with a slot 238 adapted to slidingly engage the shanks of mounting screws 240 (Fig. 9) in order that the stop element may have a precisely determined limited movement relative to the supporting plate I6. The stop element 236 is additionally provided with forwardly projecting lugs 242, one on each side of the upwardly and forwardly projecting lug 234. The length of the slot 238 is such that when an outer edge of one of the lugs 242 is engaged by a depressed pointerf2I6, said pointer will lie precisely in a vertical plane in alinement with the slot I28. This precise positioning of the depressed points will accordingly be insured regardless of the direction in which the controlling member 56 has been rotated.

It will be further observed that the width of the upwardly and forwardly projecting lug 234 bears such relation to the length of the movement limiting element I30 and the movement of g the stop element 236 that regardless of the direction of rotation of the controlling member 56, full movement of the tuning element through an angle of degrees is permitted.

It will be seen from the above description that applicant has provided a tuning indicator and dial assembly adapted for use with the more inexpensive sets, which is simple and inexpensive,

eflicient and reliable; which provides indicator means for rapidly and precisely tuning the receiver to any one of a number of desired broadcasting stations; and which means is adjustable without the aid of tools and from the exterior of the radio receiver.

Changes may be made in the form, construction and arrangement of the parts without de-' said tuning element, said movable element comprising a circular plate, a plurality of angularly spaced, radially extending selector fingers adjustably secured to the rim of said plate, a station indicator operatively associated with each selector finger, said selector fingers being adjusted into positions relative to the scale carrying element corresponding to the broadcast positions of the stations represented by said indicators, and a fixed stop indicator for indicating the position to which said selector fingers should be moved to tune the receiver to the stations represented by said station indicators.

2. In a radio receiver or the like having a tuning element, relatively fixed and movable position indicating elements, the movable one of said elements being provided with broadcast scales, means for connecting said movable element to said tuning element, said movable element comprising a circular plate, an annular member of channel cross section secured to the edge portion of said circular plate and forming a guideway extending peripherallyof the circular plate, a plurality of selectively operable, spaced controlling elements releasably secured to said annular member and slidably adjustable within said guideway, station indicators associated with said controlling elements, said controlling elements being adjusted 'into positions relative to the scale carrying element corresponding to the broadcast positions of the stations represented by said indicators, and a. fixed stop indicator for indicating the position to which said controlling elements should be moved to tune the receiver to the stations represented by the station indicators.

3. In a radio receiver or the like having a tuning element, an adjusting shaft operatively connected to said tuning element, a circular dial plate secured to said adjusting shaft,-a controlling member secured to the periphery of said dial plate, said controlling member providing an annular guideway, a plurality of selectively operable control elements secured to said controlling mem-- her for relative adjustment within said guideway, each of said elements comprising an operating portion adapted to be engaged by the finger of the operator, means extending within said guideway for adjustably clamping said portion to said controlling member, and a portion to detachably receive a station indicator, said control elements being adjustable relative to the dial plate to scale positions corresponding to the broadcasting stations represented by the station indicators, and means for determining the stop position of said dial plate to which said control elements should be moved to tune the receiver to the stations represented thereby.

4. In a radio receiver or the like having a tuning element, an adjusting shaft operatively connected to said tuning element, a circular dial plate secured to theadjusting shaft, a stationary backing plate having a radially extending opening forming pointer means for said dial plate, means connected to the dial plate for operating said. tuning element upon movement of said dial. plate, selectively operable means for moving said dial plate to selected positions whereby totune the receiver to the desired stations said dial plate being provided with a plurality of band scales, a band indicator comprising a member slidably received within the opening in said backing plate and manually operable means for selectively adjusting said indicator relative to said band scales for indicating the band to which the receiver is adjusted at any instant.

5. In a radio receiver or the like having a tun-' ing element, an adjusting shaft operatively connected to said tuning element, a circular dial plate secured to the adjusting shaft, a stationary backing plate having a radially extending opening forming pointer means for said dial plate, a controlling member secured to the periphery of said dial plate, said controlling member provlding an annular guideway, a plurality of selectively operable control elementsse'cured to said controlling member for relative adjustment 'within said guideway, each of said elements comprising an operating portion adapted to be engaged by the finger of the operator, means extending within said guideway for adjustably clamping said portion to said controlling member, and a portion to detachably receive a. station indicator, said control elements being adjustable relative to the dial plate to scale positions corresponding to the broadcasting stations represented by the station indicators, and means for determining the stop position of said dial plate to which said control elements should be moved to tune the receiver to the stations represented by the station indicators.

6. In the combination of claim 5 wherein said dial plate is provided with a plurality of band scales, 2. band indicator comprising a member slidably received within the opening in said back- 'ing plate and manually operable means for selectively adjusting said indicator relative to said band scales for indicating the band to which the receiver is adjusted at any instant.

7. In a radio receiver or the like having a tuning element, an adjusting shaft operatively connected to said tuning element, a circular dial plate secured to said adjusting shaft, a controlling member secured to the periphery of said dial plate, said controlling member providing an an- 1 nular guideway, a plurality of selectively operable control elements associated with said controlling member, each of said control elements comprising a finger portion adapted to extend radially from said controlling member, means for adjustably clamping said finger portion to said controlling member, and a station indicator detachably secured to said finger portion and extending radially of said controlling member, said controlling member having an enlarged opening communicating with said annular guideway for permitting detachment of said control elements from said controlling member, movement limiting means secured to said controlling member, and means for determining the stop position to which said control elements should be moved to tune the receiver to the stations represented thereby, said last mentioned means being adapted to engage said movement limiting means to predetermine the extreme positions of said controlling member and said tuning element.

8.-In a radio receiver or the like having a tuning element, an adjusting shaft operatively connected to said tuning element, a circular dial plate secured to said adjusting shaft, a controlling member secured to the periphery of said dial plate, said controlling member providing'an annular guideway, a plurality of selectively operable control elements associated with said controlling member, each of said elements comprising an axially depressible member, means extending within the annular guideway in said control ling member for adjustably clamping the depressible member to said controlling member, and a station indicatorassociated with said depressible member, said control elements being adjustable relative to said dial plate to scale positions corresponding to broadcasting stations represented by the station indicators, and means engageable with an operated control element for determining the stop position of said control elements for tuning the receiver to the stations represented by the station indicators.

9. In a radio receiver or the like having a being provided with broadcast scales, said movtuning element, an adjusting shaft operatively connected to said tuning element, a.circular dial plate secured to said adjusting shaft,'a controlling member secured. to the periphery of said dial plate, said controlling member providing an annular guideway, a plurality of selectively operable control elements associated with said controlling member, each of said control elements comprl's ing a cup, a station indicator in said cup, an operating member depressible parallel to the axis of said controlling member, resilient means interposed between portions of said cup and said depressible member for normally maintaining this member in its inoperative position, and means extending within the annular guideway in the controlling member for adjustably clamping said depressible member thereto, and means hav ing a predetermined-limited movement adapted to engage an .operatedcontrol element for determining the stop position of said controlling member to which said control element should be moved totune the receiver to the station represented by the station indicator forming a part of said operated control element 10. m a radio receiver or the like having a tuning element, relatively fixed and movable position indicating elements, the movable one of said elements being provided with broadcast scales, means for connecting said movable element to said tuning element, said movable element comprising a circular plate, an annular member of channel cross section secured to the edge portion of'said circular plate and forming a guideway extending peripherally of the circular plate, a plurality of selectively operable, spaced controlling elements releasably secured to said annular member and slidably adjustable within said guideway, station indicators associated with said controlling elements, said controlling elements being adjusted into positions relative to the scale carrying element corresponding to the broadcast positions of the stations represented by said indicators, a fixed stop indicator for indicating the position to which said control-- ling elements should be moved to tune the receiver to the stations represented by the station indicators, and movement limiting means secured to said annular member and adapted to engage said fixed stop indicator to predetermine the extreme positions of said annular member and said timing element.

11. Ina radio receiver or the likehaving a tuning element having an adjusting shaft extending'therefrom, relatively fixed and movable position indicating elements, the movable element able element comprising a circular, light-transmitting plate, a ring secured to the rim of said plate and having a peripherally extending guideway, a plurality of 'angularly spaced, radially extending selector fingers secured to said ring for adjustment peripherally of said guideway into positions relative to the scale carrying element corresponding to the broadcast positions of selected broadcast stations and a fixed stop indicator extending into the plane of said ring and plate for engagement with the instrumentality employed to operate a selector; finger to determine the stop position of the tuning element for tuning the receiver to the broadcast station represented by the selectively operated selector finger.

12. In a radio receiver or the like having}! tuning element having an adjusting shaft extending therefrom, relatively fixed and movable position indicating elements, the movable element being provided with broadcast scales, said relatively movable element comprising a circular, light-transmitting plate,-a ring secured to the rim of said plate and having -a peripherally extending guideway,- a plurality of 'angularly spaced-radially extending selector fingers secured to said ring for adjustment peripherally of said,

guideway into positions relative to the scale carrying element corresponding to the broadcast positions of selected broadcast stations, a fixed stop indicator extending into the plane of said ring and plate for engagement with the instrumentality employed to operate a selector finger to determine the stop "position of the tuning element for tuning the receiver to the broadcast stationrepresented by the selectively operated selector finger, and vernier means for tuning said shaft independently of said selector fingers.

13. In a radio receiver or the like having a tuning element, cooperating and relatively movable scale and pointer elements, one of which is connected to said tuning element, for indicating the position .of said tuning element, said scale element comprising a light-transmitting dial plate provided with a plurality of band scales, a backing plate for said dial plate, said backing plate having a slot therein extending transversely of said band scales, a band indicator comprising a member slidably received within the slot in said backing platb and manually operable means for selectively adjusting said band indicator relative to said band scales for indicating the band to which the receiver is adjusted at any instant.

WILLIAM J. SCHNELL'. 

